CN1048806A

CN1048806A - A kind of self discarding syringe

Info

Publication number: CN1048806A
Application number: CN90102235A
Authority: CN
Inventors: 卡尔洛斯·埃杜亚多·阿库新
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-03-22
Filing date: 1990-03-22
Publication date: 1991-01-30
Also published as: US5135495A; IL93843A0; EP0392228A3; AU637358B2; CA2012801A1; EP0392228A2; AR240257A1; AU5212790A; DE69004611D1; BR9001340A; ATE97328T1; ZA902211B; KR900013998A; JPH0375A; EP0392228B1

Abstract

A kind of self discarding syringe that can only be used once, it can only once fill medicine operation, and injecting with this medicament, and this medicament in syringe can only be extruded once.This be because, forming the structure of piston and the bar of control piston has determined with the moving limiting element that the syringe body is had: regardless of the displacement of bar or outer effect with bar and the bonded attempt of piston, piston in the syringe body behind the bidirectional-movement can not by manipulation be stopped.

Description

A kind of self discarding syringe

The present invention relates to a kind of be used for medical treatment and other field or technology can only expendable self discarding syringe.

In medical skill, owing to infect, be well-known to demand that can only expendable syringe, be do not allow to reuse may used syringe in this case.

Conventional injector is repeated to use, though but they be designated as can only expendable disposable element.But this can not be avoided them to be repeated to use, and therefore, patient can't determine that this element was not used in the past.

The invention provides a kind of self discarding syringe, this syringe can only be used once, because it can only once fill medicine operation, injecting with this medicament, and the medicament in syringe can only be extruded once.This be because, forming the structure of piston and the bar of control piston has determined with the moving limiting element that the syringe body is had: regardless of the displacement of bar or outer effect with bar and the bonded attempt of piston, piston in the syringe body after two-way the moving can not by manipulation be stopped.

In order to keep handling, this new syringe has by two pistons of forming of complement independently.

They one of be the element that when it moves, rubs mutually with the syringe inwall.Another is an element with definite geometry, it is connected on the bar and allows when it passes through the hole of first element central authorities according to first its state of element adjustment, so first element can only be taken out, push away once at opposite both direction.This is possible, because one of two elements are elastic, another is inflexible, and an element limits piston moving in syringe arranged.

Self discarding syringe, object of the present invention is made of a spout of a tubular body and its end.One reasonably well is matched with this intravital piston and moves therein.Piston is made up of two complementary elements.First element is matched with in the chamber of syringe body, and second element has a geometry, can be tubular circular cone or cylinder or semicolumn or polygonal body, and be fixed on the bar of mobile piston.

Second element by on said first element have the hole of the diameter littler than second element the time, can change its position with respect to first element.This owing to-in a kind of selection mode, be to make one of in-two elements by elastomeric material, another is a rigid material, and the syringe body has rigidity to a certain extent, the element that limited piston moves, its function be to allow second element-piston formed thereon-change its position with respect to first element.

For the advantage of simply speaking of is described, and these advantages can be replenished more by brainstrust; For the characteristics on structure, composition and the function of more easily understanding self discarding syringe of the present invention, will describe preferred embodiment as shown in drawings below simultaneously, aspect invention scope, not be subjected to the restriction of embodiment.

Fig. 1 has shown one according to syringe of the present invention.

Fig. 2 is the perspective view that part is cut open.

Fig. 3 has shown a distortion of piston structure.

Fig. 4 has shown another distortion of piston structure.

Fig. 5 is along the profile of the limiting element of V-V line among Fig. 1.

Fig. 6 and Fig. 7 are the profiles of the distortion of limiting element.

Fig. 8,9,10,11 and 12 has shown position of piston and its composed component in injection manipulation.

As shown in the figure, self discarding syringe is by one endways or hold 2 individualities 1 that have the pipe of a spout to form to constitute.A piston 3 places body 1, and it is a piston mobile.

Piston 3 forms by having first element 4 with the akin exterior contour of in-profile of body 1.The middle body of element 4 has a hole 5, the slightly larger in diameter in hole 5 in the diameter of the leading end 6 of common second element 7 that forms pistons 3 of element 4.

Have the shape of a frustum of a cone 8 among 7 one embodiment of second element, its less bottom is connected on the bar 9 of control piston 3 mutually.The bigger bottom of frustum of a cone 8 is fixed on the leading end 6.When piston 3 was positioned at the top of the body 1 that comprises spout 2, frustum of a cone 8 relied on the less conical portion in bottom surface in its hole 5 that is guided in element 4 and is positioned.

In another embodiment, as shown in Figure 3, second element is spheroplast 10, and leading end 6 and bar 9 are fixed on the just in time relative two ends of this ball.

In addition, as shown in Figure 4, second element 7 is half sphere shape 11, and bar 9 is the land portions that are connected in hemisphere, and leading end 6 is connected in the planar section of hemisphere.Second element 7 also a complementary elements constituting of polygon geometry remove to form piston 3.

The body 1 of syringe has a limiting element 12 to moving at the tail end place near it.This limiting element can be formed by the protruding block of 120 ° of spaces, as shown in Figure 5, or as shown in Figure 6 and Figure 7, forms by flattening body.

The bar 9 of application piston 3 can be cylindrical across, and suitable afterbody is arranged for using.

Fig. 8 to Figure 12 has shown the operation of self discarding syringe.

When piston at spout 2(Fig. 8) when locating, this is the essential condition of filling medicine, second element 7 is between the terminal and first element 4 of body 1.Then move and when attracting medicament to enter syringe when piston is driven by bar, element 7 is directed the hole 5 of element 4 into and forms a full watertight state, as shown in Figure 9.

When piston 3 arrives moving limiting elements 12, and when wishing the medicament of inhalation syringe discharged, must continue to draw the bar of syringe, till second element 7 is in position shown in Figure 10 along identical direction.This is because one of element 4 and 7 are elastic, and another is inflexible.

From position shown in Figure 10, can plus-pressure on bar, element 4 and the combination of 7 this moments are moved as a piston, and the medicament in the inhalation syringe is discharged (as Figure 11) from spout 2, arrive the terminal point (Figure 12) that moves up to " piston ".

As think topping up once more, because element 7 can not be incorporated into element 4 again, thereby element 7 will be separated with element 4, so piston can not be handled (Figure 12).Therefore, syringe can not reuse.

It is impossible that attempt places the initial position of Fig. 8 with element 7.This is because leading end 6 has contacted the bottom of syringe, does not allow element 7 by hole 5.

When the present invention is implemented, undoubtedly can correct on some details, but can not leave the cardinal principle that following claim is clearly described.

Claims

After describing and having determined character of the present invention and scope and implementation method, state following requirement about the present invention and right to exclude all others thereof:

1, a kind of self discarding syringe, there is the pipe of a spout to constitute by a bottom, a piston is arranged in the body, it is characterized in that, this piston is made up of two elements, and these two elements can interiorly mutually connect and one of them element can pass another element, selectively, one of them element is inflexible and another is elastic, and this body has the limiting element that move of this piston in the part of this body.
2, a kind of self discarding syringe as claimed in claim 1 is characterized in that, one of element that constitutes described piston is first element, and it has the exterior contour that offsets with this inboard wall of tube body, and this first element has a centre bore.
3, a kind of self discarding syringe according to claim 1, it is characterized in that, another element of forming described piston is second element, it has one as frustum of a cone or cylinder or semicolumn or polygonal geometry, and this second element can be connected on first element selectively.
4, a kind of self discarding syringe as claimed in claim 3 is characterized in that a bar and a cylindrical end block are fixed on two relative endface position of described second element.
5, a kind of self discarding syringe as claimed in claim 1 is characterized in that, forms described two elements of described piston, each in them, selectively one by elastic materials another is made of the rigid material body.
6, a kind of self discarding syringe as claimed in claim 1 is characterized in that, described moving limiting element is to be formed by the 120 ° of protruding blocks that are arranged on the inboard wall of tube body of described syringe body in space.
7, a kind of charging-self type syringe as claimed in claim 6 is characterized in that, described moving limiting element causes curved shape to form by flattening described tube wall.
8, a kind of self discarding syringe as claimed in claim 6 is characterized in that, described moving limiting element causes rectangular shaped to form by flattening described tube wall.
9, a kind of self discarding syringe as claimed in claim 6 is characterized in that, described moving limiting element is to be formed by a lining that is combined into one with the described syringe body that comprises described bar.
10, a kind of self discarding syringe as claimed in claim 6 is characterized in that, described moving limiting element is to form by flattening body in the terminal of described syringe.